RSW

Seems like this is part of the issue, the emission regs that in part have led to manufacturers introducing systems like the 48/12V MHEV aren't matched by safety regs that consider the risk of poor implementations - lack of redundancy, driver warning etc in the event off failure, especially given the way this one unfolds consequences wise. I suspect that there will be broader pieces of existing legislation region by region that cover a manufacturers duty of care if they become aware of an issue that has significant - albeit unintended- safety consequences. Plausible that this is in part what the US Class Action case will push on. Either way it's not great that Audi seem to be prepared to let customers spin the wheel! Having read some of the examples behind the US litigation they are pretty unpleasant, cars effectively becoming bricked after 10-20 mins with not even enough charge to operate hazard lights. @Mark2 glad to hear they paid your tow fees, least they could do. Perhaps this is one to push to Which or one of the other UK consumer rights programmes like watchdog to put a a bit more of a sense of urgency into Audi on at least a warning feature. Nothing galvanises corp responses like a spot on Watchdog!

Now that's some mileage - impressive, I can't imagine many of today's vehicles doing that. Good luck with the £235, least they can do!!

Ironic that emissions regs dictated the need for the mild hybrid system from a number of these manufacturers on their performance cars, yet safety regs haven't caught up with the customer protections needed to safeguard against implications of poor manufacturer design/implementation of these systems. The Nissan approach on the GTR to a number of the sound and emissions regs was probably cleaner - just stop shipping in Europe!

Thanks for sharing the update and sorry to hear they haven't been more helpful - sadly not hugely surprised. Was hoping they would clarify whether the root causes are understood and can be permanently rectified via new parts/software fixes. Sounds like they are taking the fix it (but like for like) when it breaks approach by extending warranties. I imagine they will simply be increasing inventory on these parts and clawing back something from component suppliers as well. Ultimately they are leaving customers to endure the hassle and worry when it does happen. Completely agree they should be giving customers an advisory on what to do when a flurry of electrical system warning signals start appearing given that that the shut down is simply dangerous. I only hope someone who doesn't know what to do like you doesn't get caught out and hurt as result of being stranded in fast moving traffic. Let's hope the US class action invokes something a bit more customer orientated, won't be holding my breath though. Hope the issue doesn't rear its head for you again. RS6 C8 is a an amazing car, can't believe it and others sharing this BSG MHEV system have such a dreadful design flaw ticking away outcome wise, a serious lack of design redundancy/warning given the impact it has when it fails. Have decided to start looking at M3 touring, but checking it doesn't have a similar Mild Hybrid set up (seems Merc E63s wagon equiv now does) . . . I should have gone with one of the last C7s, same performance give or take but minus the MHEV nonsense.

Hello @Mark2, thanks for sharing this. Did you get a response from Audi UK on the BSG MHEV fault? I was about to purchase a 2022 RS6 but heard of this issue when looking at recalls. Not usually worried about issues occurring as I have experienced a fair few recalls on a number of performance cars -to be expected to a degree given the engineering/complexity- but this one feels different. Given our somewhat questionable smart motorways the thought of getting very little warning before the car starts to shut down simply sounds dreadful. Appreciate all cars breakdown, blow outs happen etc but having this as something that can happen with limited warning, resulting in a complete car shut down seems unacceptable, certainly wouldn't be comfortable taking kids on long journeys with that as a background nag. We are surrounded by smart motorways where I live and despite pushing on the issue with the Audi dealership -not unsurprisingly- they seem reluctant to provide a definitive position on whether the issue is recognised, whether it has been fully root caused and whether the replacement component(s)/software fixes have been fixed in the event it occurs vs like for like replacement with the prospect of a repeat. Disappointing as I was really looking forward to buying this car. Completely agree with your position on not taking the car back until they can definitively answer your questions. Would be good to hear where you get to on this, good luck!